HIM
30
The Interface Solution Experts
Smart HART
Loop
Interface and Monitor
Installation
Installation consists of physically mounting the unit
and completing the electrical connections.
Mounting
The HIM is designed to snap easily onto 35mm Top
Hat (EN50022) DIN-rails.
Making the Electrical Connections
After mounting, you are ready to connect the HIM to
the loop. Each unit comes equipped with a transmitter
excitation terminal which allows it to supply power to
the monitored HART instrument, if necessary. Figures
5 and 6 show the connection diagrams for an HIM with
or without using the transmitter excitation current.
Recommended Ground
Wiring Practices
Moore Industries recommends the following ground
wiring practices:
• Any Moore Industries product in a metal case or
housing should be grounded.
• The protective earth conductor must be connected
to a system safety earth ground before making
other connections.
• All input signals to, and output signals from,
Moore Industries’ products should be wired using
a shielded, twisted pair wiring technique. Shields
should be connected to an earth or safety ground.
• For the best shielding, the shield should be run
all the way from the signal source to the receiving
device. (see Note below)
• The maximum length of unshielded input and
output signal wiring should be 2 inches.
Note:
Some of Moore Industries’ instruments can be
classified as receivers (IPT
2
, IPX
2
, etc.) and some
can be classified as transmitters (TRX, TRY, etc.)
while some are both a receiver and a transmitter
(SPA
2
, HIM, etc). Hence, your shield ground
connections should be appropriate for the type
of signal line being shielded. The shield should
be grounded at the receiver and not at the signal
source.
CE Conformity
Installation of any Moore Industries’ products that
carry the CE marking must adhere to the guidelines in
the Recommended Ground Wiring Practices section in
order to meet the EN 61326 requirements set forth in
the applicable EMC directive.
Power Sourcing Parameters for General Locations,
Intrinsically Safe, and Non-Incendive/Type N
Applications
In accordance with IEC 61010.1 Annex H (all models),
the input terminals must be connected to and/or
supplied from a certified energy limiting Class 2
or a Separate Extra Low Voltage (S.E.L.V.) power
supply separated from all mains by double/reinforced
insulation.
Operation
Once programmed, calibrated, installed, and supplied
with the correct power, the instrument begins to
operate immediately. Depending upon environmental
conditions, it can be expected to operate unattended
for extended periods of time.
Maintenance
Moore Industries suggests a check for terminal
tightness and general unit condition every 6-8 months.
Always adhere to any site requirements for
programmed maintenance.
Customer Support
If service assistance is ever required for an instrument
in your application, refer to the back cover of this
manual for the telephone numbers to Moore Industries’
customer service department.
If possible, make a note of the model number of the
offending unit before calling. For fastest assistance,
have the following available: serial number and the
job and purchase order number under which it was
shipped.
